Abstract
We describe the advertisement call of A. maranguapensis an endangered species endemic to Serra de Maranguape, Ceará, northeastern Brazil (Cassiano-Lima et al., 2011). The monophyletic genus Adelophryne includes eight nominal species and a number of unnamed species of small frogs with direct development, which occur in Amazon, Atlantic Forest, and humid forested mountains of Northeast Brazil (Fouquet et al. 2012). Only the advertisement calls of A. adiastola, A. gutturosa, A. patamona, and A. mucronatus have been so far described (see MacCulloch et al., 2008; Lourenço-de-Moraes et al., 2012).